Alert archive / South Dakota / Flash Flood Warnings in 2016

Flash Flood Warning 28, NWS Sioux Falls, SD

September 15, 20169 counties in South Dakota; Lyon County, Iowa

NWS Sioux Falls, SD issued this flash flood warning at Sep 15, 2016, 11:34 AM CDT for 9 counties in South Dakota; Lyon County, Iowa. It was in force for 3 hr. 8 reports came from inside the area while it was in force.

The area

The outline as issued, with what was reported inside it.

The facts

Issued
Sep 15, 2016, 11:34 AM CDT (16:34 UTC)
Expired
Sep 15, 2016, 2:30 PM CDT
In force
3 hr
Issued by
NWS Sioux Falls, SD
Area
Storm-based polygon
Flood severity
None

Counties Lyon County, IA, Bon Homme County, SD, Clay County, SD, Hutchinson County, SD, Lincoln County, SD, McCook County, SD, Minnehaha County, SD, Turner County, SD, Union County, SD, Yankton County, SD

The radar

The Sioux Falls radar (KFSD), 86 km from the middle of the area, began a volume at 16:38 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

What was reported inside it

TimeReportWhereRemark
Sep 15, 12:20 PM CDTFLASH FLOOD4 Nw Harrisburg, SDYARDS AND DITCHES FLOODED IN SOUTHWESTERN SIOUX FALLS.
Sep 15, 12:45 PM CDTHEAVY RAIN 4.5Tyndall, SDSOCIAL MEDIA REPORT.
Sep 15, 12:45 PM CDTHEAVY RAIN 4.5Tyndall, SDSOCIAL MEDIA REPORT. THE DURATION OF THE HEAVY RAIN EVENT WAS 3 HOURS.
Sep 15, 1:00 PM CDTFLASH FLOODTyndall, SD4.55 INCHES OF RAIN...WIDESPREAD STREET FLOODING.
Sep 15, 1:21 PM CDTFLASH FLOODLesterville, SDWIDESPREAD STREET FLOODING.
Sep 15, 1:23 PM CDTFLASH FLOOD2 Sw Sioux Falls, SDWIDESPREAD STREET FLOODING.
Sep 15, 1:26 PM CDTFLASH FLOOD4 Ssw Sioux Falls, SDWIDESPREAD STREET FLOODING.
Sep 15, 2:35 PM CDTFLASH FLOOD4 N Tea, SDFLOODING AT PETTIGREW ELEMENTARY SCHOOL AND PARK.

Local storm reports filed while the alert was in force, from inside its polygon or its counties.

The nearest sounding before it

Omaha, NE (KOAX), launched 12:00Z, 4.6 hours before the alert went out and 192 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Omaha, NE at 12:00Z on 2016-09-15Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 696 joules per kilogram.LCLLFCEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Omaha, NE at 12:00Z on 2016-09-15The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 118 square meters per square second.1939Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
696 J/kg
Mixed-layer CIN
-65 J/kg
Mixed-layer LCL
648 m above ground
0-6 km bulk shear
26 kt
0-1 km storm-relative helicity
118 m²/s²
0-3 km storm-relative helicity
138 m²/s²
Significant tornado parameter
0.0
Supercell composite
1.1

Open this sounding in Storm Lab

The text

As transmitted.

856 
WGUS53 KFSD 151634
FFWFSD
IAC119-SDC009-027-067-083-087-099-125-127-135-151930-
/O.NEW.KFSD.FF.W.0028.160915T1634Z-160915T1930Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/

BULLETIN - EAS ACTIVATION REQUESTED
FLASH FLOOD WARNING
NATIONAL WEATHER SERVICE SIOUX FALLS SD
1134 AM CDT THU SEP 15 2016

THE NATIONAL WEATHER SERVICE IN SIOUX FALLS HAS ISSUED A

* FLASH FLOOD WARNING FOR...
  NORTHWESTERN LYON COUNTY IN NORTHWESTERN IOWA...
  SOUTHERN MINNEHAHA COUNTY IN SOUTHEASTERN SOUTH DAKOTA...
  EASTERN HUTCHINSON COUNTY IN SOUTHEASTERN SOUTH DAKOTA...
  NORTHWESTERN UNION COUNTY IN SOUTHEASTERN SOUTH DAKOTA...
  YANKTON COUNTY IN SOUTHEASTERN SOUTH DAKOTA...
  CLAY COUNTY IN SOUTHEASTERN SOUTH DAKOTA...
  SOUTHEASTERN MCCOOK COUNTY IN SOUTHEASTERN SOUTH DAKOTA...
  LINCOLN COUNTY IN SOUTHEASTERN SOUTH DAKOTA...
  SOUTHEASTERN BON HOMME COUNTY IN SOUTHEASTERN SOUTH DAKOTA...
  TURNER COUNTY IN SOUTHEASTERN SOUTH DAKOTA...

* UNTIL 230 PM CDT

* AT 1131 AM CDT...DOPPLER RADAR AND AUTOMATED RAIN GAUGES INDICATED
  THUNDERSTORMS PRODUCING HEAVY RAIN ACROSS THE WARNED AREA. ONE TO
  THREE INCHES OF RAIN HAVE ALREADY FALLEN. FLASH FLOODING IS
  EXPECTED TO BEGIN SHORTLY.

ADDITIONAL RAINFALL AMOUNTS OF UP TO 2 INCHES ARE POSSIBLE IN THE
WARNED AREA. FLASH FLOODING WILL PRIMARILY AFFECT URBAN AREAS.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TURN AROUND...DON'T DROWN WHEN ENCOUNTERING FLOODED ROADS. MOST FLOOD
DEATHS OCCUR IN VEHICLES.

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...URBAN AREAS...HIGHWAYS...STREETS AND
UNDERPASSES AS WELL AS OTHER DRAINAGE AREAS AND LOW LYING SPOTS.

&&

LAT...LON 4273 9691 4272 9696 4276 9698 4277 9713
      4281 9721 4285 9722 4287 9731 4284 9770
      4287 9785 4283 9788 4285 9807 4371 9739
      4372 9647 4271 9681

$$

GILLISPIE
1 follow-up statement
155 
WGUS73 KFSD 151829
FFSFSD

FLASH FLOOD STATEMENT
NATIONAL WEATHER SERVICE SIOUX FALLS SD
129 PM CDT THU SEP 15 2016

IAC119-SDC009-027-067-083-087-099-125-127-135-151930-
/O.CON.KFSD.FF.W.0028.000000T0000Z-160915T1930Z/
/00000.0.ER.000000T0000Z.000000T0000Z.000000T0000Z.OO/
LYON IA-MINNEHAHA SD-HUTCHINSON SD-UNION SD-YANKTON SD-CLAY SD-
MCCOOK SD-LINCOLN SD-BON HOMME SD-TURNER SD-
129 PM CDT THU SEP 15 2016

...THE FLASH FLOOD WARNING REMAINS IN EFFECT UNTIL 230 PM CDT FOR
NORTHWESTERN LYON...SOUTHERN MINNEHAHA...EASTERN HUTCHINSON...
NORTHWESTERN UNION...YANKTON...CLAY...SOUTHEASTERN MCCOOK...
LINCOLN...SOUTHEASTERN BON HOMME AND TURNER COUNTIES...

AT 128 PM CDT...DOPPLER RADAR AND AUTOMATED RAIN GAUGES INDICATED
THAT HEAVY RAIN WAS FALLING OVER THE AREA. UP TO FIVE INCHES OF RAIN
HAVE ALREADY FALLEN. FLASH FLOODING IS ALREADY OCCURRING.

ADDITIONAL RAINFALL AMOUNTS OF UP TO 2 INCHES ARE STILL POSSIBLE IN
PORTIONS OF THE WARNED AREA.

PRECAUTIONARY/PREPAREDNESS ACTIONS...

TURN AROUND...DON'T DROWN WHEN ENCOUNTERING FLOODED ROADS. MOST FLOOD
DEATHS OCCUR IN VEHICLES.

EXCESSIVE RUNOFF FROM HEAVY RAINFALL WILL CAUSE FLOODING OF SMALL
CREEKS AND STREAMS...URBAN AREAS...HIGHWAYS...STREETS AND
UNDERPASSES AS WELL AS OTHER DRAINAGE AREAS AND LOW LYING SPOTS.

PLEASE REPORT FLOODING TO YOUR LOCAL LAW ENFORCEMENT AGENCY WHEN YOU
CAN DO SO SAFELY.

&&

LAT...LON 4273 9691 4272 9696 4276 9698 4277 9713
      4281 9721 4285 9722 4287 9731 4284 9770
      4287 9785 4283 9788 4285 9807 4371 9739
      4372 9647 4271 9681

$$

GILLISPIE

The office that day

Everything else NWS Sioux Falls, SD issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Sep 15, 1:40 PM CDTFlash Flood WarningFSDLincoln, Minnehaha3 hr
Sep 15, 2:11 PM CDTFlash Flood WarningFSDBon Homme, Clay, Hutchinson, Lincoln, McCook, Minnehaha and 3 more3 hr
Sep 15, 4:37 PM CDTFlash Flood WarningFSDLincoln3 hr
Sep 15, 4:07 PM CDTFlash Flood WarningFSDClay, Dickinson, O'Brien, Osceola, Sioux3 hr
Sep 15, 5:53 PM CDTFlash Flood WarningFSDBuena Vista, Cherokee, Clay, O'Brien3 hr

Nearby

Flash Flood Warnings in South Dakota, 2016Flash Flood Warnings in Iowa, 2016Every flash flood warning in 2016

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; local storm reports from the same archive; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.